import { global } from '@storybook/global';

import { LitElement, html, css } from 'lit-element';

const { CustomEvent } = global;

const demoWcCardStyle = css`
  :host {
    display: block;
    position: relative;
    width: 250px;
    height: 200px;
    border-radius: 10px;
    transform-style: preserve-3d;
    transition: all 0.8s ease;
  }

  .header {
    font-weight: bold;
    font-size: var(--demo-wc-card-header-font-size, 16px);
    text-align: center;
  }

  .content {
    padding: 20px 10px 0 10px;
    flex-grow: 1;
  }

  .footer {
    display: flex;
  }

  dl {
    margin: 0;
    text-align: left;
  }

  dd {
    margin-left: 15px;
  }

  button {
    border-radius: 15px;
    width: 30px;
    height: 30px;
    background: #fff;
    border: 1px solid #ccc;
    color: #000;
    font-size: 21px;
    line-height: 27px;
    font-weight: bold;
    cursor: pointer;
    margin: 5px;
  }

  .note {
    flex-grow: 1;
    color: #666;
    font-size: 16px;
    font-weight: bold;
    text-align: left;
    padding-top: 15px;
  }

  :host([back-side]) {
    transform: rotateY(180deg);
  }

  #front,
  #back {
    position: absolute;
    width: 250px;
    box-sizing: border-box;
    box-shadow: #ccc 3px 3px 2px 1px;
    padding: 10px;
    display: flex;
    flex-flow: column;
    top: 0;
    left: 0;
    height: 100%;
    border-radius: 10px;
    backface-visibility: hidden;
    overflow: hidden;
  }

  #front {
    background: linear-gradient(141deg, #aaa 25%, #eee 40%, #ddd 55%);
    color: var(--demo-wc-card-front-color, #000);
  }

  #back {
    background: linear-gradient(141deg, #333 25%, #aaa 40%, #666 55%);
    color: var(--demo-wc-card-back-color, #fff);
    text-align: center;
    transform: rotateY(180deg) translate3d(0px, 0, 1px);
  }

  #back .note {
    color: #fff;
  }
`;

/**
 * This is a container looking like a card with a back and front side you can switch
 *
 * @slot - This is an unnamed slot (the default slot)
 * @fires side-changed - Fires whenever it switches between front/back
 * @cssprop --demo-wc-card-header-font-size - Header font size
 * @cssprop --demo-wc-card-front-color - Font color for front
 * @cssprop --demo-wc-card-back-color - Font color for back
 * @csspart front - Front of the card
 * @csspart back - Back of the card
 */
export class DemoWcCard extends LitElement {
  static get properties() {
    return {
      backSide: {
        type: Boolean,
        reflect: true,
        attribute: 'back-side',
      },
      header: { type: String },
      rows: { type: Object },
    };
  }

  static get styles() {
    return demoWcCardStyle;
  }

  constructor() {
    super();

    /**
     * Indicates that the back of the card is shown
     */
    this.backSide = false;

    /**
     * Header message
     */
    this.header = 'Your Message';

    /**
     * Data rows
     */
    this.rows = [];
  }

  toggle() {
    this.backSide = !this.backSide;
  }

  render() {
    return html`
      <div id="front" part="front">
        <div class="header">${this.header}</div>
        <div class="content">
          <slot></slot>
        </div>
        <div class="footer">
          <div class="note">A</div>
          <button @click=${this.toggle}>></button>
        </div>
      </div>
      <div id="back" part="back">
        <div class="header">${this.header}</div>

        <div class="content">
          ${this.rows.length === 0
            ? html``
            : html`
                <dl>
                  ${this.rows.map(
                    (row) => html`
                      <dt>${row.header}</dt>
                      <dd>${row.value}</dd>
                    `
                  )}
                </dl>
              `}
        </div>
        <div class="footer">
          <div class="note">B</div>
          <button @click=${this.toggle}>></button>
        </div>
      </div>
    `;
  }

  updated(changedProperties) {
    if (changedProperties.has('backSide') && changedProperties.get('backSide') !== undefined) {
      this.dispatchEvent(new CustomEvent('side-changed'));
    }
  }
}

customElements.define('input', DemoWcCard);
